weight = input("weight: ")
unit = input("(L)bs or (K)g: ")
if unit.upper() == "L":
    weight_k=float(weight)*0.45
    print(f"you are {weight_k} kilogram ")
elif unit.upper() == "K":
    weight_l = float(weight)/0.45
    print(f"You are {weight_l} pounds")
else:
    print("enter L OR K !")    